50 A 



LICHENALES. 



[Thallogens. 



Palaa mentions another Lichen which is eaten by the Kirghiz Tartars, under the 

 Dame of Earth-bread. This, however, has a very different habit, covering the surface 

 of the steppes with a whitish grey crust and breaking into many fragments when the 

 Boil is dry. It appears to be eaten only in cases of extreme necessity, and is 

 constantly accompanied by the common Nostoc— Berkeley in Gardeners' Chronicle, 



Tulasne has made the curious observation that some of the species of this order 

 arc true parasites upon other Lichens. 



ADDITIONAL GENEBA, &c. 



phytum, Montague, 

 ru .1 BpU 



Stereo- 

 Ion. 



Ascidium, fee, near The- 

 lotrema. 



Acroscyplius, Leveille, 

 near* Spluerophoron. 



Myriangium, Berkeley, 

 near Collema. 



e, Decaisne = 

 Faulia. 



7q o e 





C, c 



Fig. XX XI II.**** 



Parasites. 

 Abrothallus,DeA T o/"Ws. 

 Scutula, TxiXasne. 

 Celidium, Tulasne. 

 Phacopsis, Tulasne. 





Fig. XXXIII, • •• \ greatly magnified view of a perpendicular section of Parmelia aipolia, shewing 



(ho tin. ;r in the shield, a ,• 6, the hypotheclum and some gonidia beneath it; c, the medullary region; 

 and d, the gonimic la; er 





